Means for transmitting movements and indicating positions electrically.



No. 706,28L' Patented Aug. 5, I902.

w. A. TIIIERMANN.

MEANS FOR TRANSMITTING MOVEMENTS AND INDICATING POSITIONS ELEGTRICALLY.

(Application filed Apr. 4, 1902.) (No MbdeI.) 2 Sheels-Sheet I.

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W. A. THIERMANN.

MEANS FOR TRANSMITTING MOVEMENTS AND INDICATING POSITIONS ELECTRICALLY.

(Application filed A m 4, 1902.; I (No Model.) 2 Sheets$heet 2.

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25 source of electricity.

UNITED STATES PATENT OFFICE.

VVILI-IELM AUGUST THIERMANN, OF HANOVER, GERMANY.

MEANS FOR TRANSMITTING MOVEMENTS AND lNDlCATlNG POSITIONS ELECTRICALLY.

SPECIFICATION forming part of Letters Patent No. 706,281, dated August5, 1902. Original application filed November 12 1901, Serial No. 82,029.Divided and this application filed April 4, 1902. Serial of Prussia,Emperor of Germany, residing at 19 Oeltzenstrasse, Hanover,Germany, haveinvented certain new and useful Improvements in Means for TransmittingMovements and Indicating Positions Electrically, of which the followingis a specification.

The present invention relates to a system of transmitting movements andindicating positions by means of pulsating direct current, single orpolyphase alternating current. In

this system two or more apparatuses may be employed. Every apparatusconsists of a movable member (the rotor) and of a station ary member,(the stator.) The rotors are bipolar and have no winding. The stator ofeach apparatus has a winding which is divided in sections. Thesesections of all stators are respectively connected in parallel. One ofthe stators must have a second winding which is to be connected to asuitable This winding acts as primary coil of a transformer, and theother winding of this stator acts as secondary coil of which thesections of windings of all other stators are branched off inparallel-4L. 6., in

0 such a Way that the sections of each winding are connected to therespective sections of all other stators. The stator, which is suppliedwith the primary and the secondary coils, is preferably any of thosekinds described in my specification, Serial No. 82,029, filed November12, 1901, from which this specification has been derived by way ofdivision.

If the rotor of any apparatus is moved or shifted-for instance, byhand-compensato ing currents will arise and cause the correspondingmovement of all other rotors. Therefore every apparatus may be employedas transmitter or as receiver.

The accompanying drawings illustrate in Figure 1 the combination of oneapparatus whose stator has a primary and a secondary winding with anapparatus whose stator has only one winding connected in parallel to thesecondary winding of the first apparatus.

Fig. 2 is a detail sectional View.

(N0 model.)

Itis to be well understood, that more apparatuses with only one windingmay be employed according to the desired number of stations, which shallreceive the same movements of the rotors. For instance, the drawingsshow connecting-lines l m n for a second and connecting-lines P072 11for a third apparatus. In the same manner may be arranged furtherlinessay Z M qfi-via, 1* m nand so on, according to the desired numberof apparatuses. It is further to be well understood that instead of theapparatuses shown in the drawings any other suitable form my be made useof-for instance, such of the kinds described in my application SerialNo. 82,029.

In the drawings the stator of the apparatus X consists of an iron ringa, made, preferably, of single-ring laminae. On the ring a is placed theencircling winding Z), which is divided in three sections by the pointsA I) O. The rotor 0, preferably also made of iron laminze, has nowindings and is bipolar. It is supported by the axle (1, running insuitable bearings. (Not shown in the drawings.)

The apparatus Y consists of two concentric rings 3 and y,which areconnected with each other by means of three radial spokes On the ringsare placed the encircling secondary windings 1), three points of which,A B O, are connected with three corresponding points A B O of thewinding a of apparatus X by the lines Z m '22. On the spokes a are woundcoils a, which are connected to a source of electricity D. The stator c,fixed to the axle d, is bipolar and has no windings. One pole of thestator 0' works with the inner side of the inner ring and the other withthe outer side of the outer ring. Stator and rotor are also preferablymade by iron laminae. Preferably a hell 6 is inserted in one of theconnecting-linessay line m at the apparatus X and line it at theapparatus Y.

Let us assume for the purpose of explaining the method of operation thatthe apparatus X is the transmitter and the apparatus Y the receiver andthat the rotor d of the transmitter'has just been moved or shifted by animpulse which is to effect during the next instant the same position ofthe rotor d in the receiver Y. The lines of force generated by eachprimary winding are indicated on the drawings by two broken lines, theirmomentary direction being marked by the arrows. They take a path whichvaries according to the position of the rotor and is dependent thereonand are in a manner fixed only in their central portions by the primarywindings. The mannerin which their ends unite is, however, dependentonthe position at that time of the corresponding rotor. From the path ofthe lines of force in the lower figure it results that the difference ofpotential at the end of the coil A 13 in the assumed position of therotor is approximately equal to that at the terminals of the coil B C,but that these differences of potential are of opposite sign. Thedifference of potential between the ends of the coil C A. is, on theother hand, considerablysmaller, even almost zero, as the windings ofthis coil are cut by approximately half the lines of force in onedirection and by the other half of the lines of force in the oppositedirection. Consequently the points A B C are at different potentials.Other differences of potential exist between the points A B C in thereceiver than those between the corresponding points A B O of thetransmitter which are connected with them. Compensating currents willconsequently have to how between the points A and A, B and B, G and Cuntil the points connected with each other have the same potential. Thistakes place when the lines of force of the magnetic field of thereceiver have moved into exactly the same position as those of thetransmitter. The field of magnetic force can move in this manner,however, onlyif the rotor also moves. The rotor does actually move as itnaturally adjusts itself, so that the magnetic reluctance is a minimum.In the position of rest it consequently always connects the places wherethe lines of force are most dense in the outer and inner rings. If therotors are now rotated successively into any desired number ofpositions, it will be found that the total number of lines of forcepassing through the secondary winding always remains unaltered, but thatnotwithstanding even a slight movement of the rotor correspondinglydifferent potentials arise at the points A, B, and O.

The bells e are so regulated that they only ring it rather strongcurrents pass them. Since such currents only How in the lines at themoment when the transmitter is displaced, the bell will give notice ofevery alteration in the position of the indicator.

Instead of branching off other apparatus with only one winding there mayalso be employed apparatuses with primary and with secondary windings,as Y, or such appara tuses as described in my application, Serial No.82,020, filed November 2,1901.

In the new system, transmitter and receiver can constantly exchangefunctions; theymay be excited with primary current or not, and themovement of one apparatus, is in all cases transmitted synchronously tothe others. Moreover, as already stated above, it is of no consequencewhether the primary coils are supplied with pulsating direct current,single or polyphase alternating current. The indicators of theapparatuses can be fixed direct on the rotors, so that any furthermechanical gearing (pawls, gear-wheels, and the like) is obviated.Finally,there may be mentioned as special advantages of this system thatcurrent-conducting movable members are nowhere present and-that thenumber of adjustment or stopping places is unlimited and independent ofthe number of connecting-wires.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a system for the transmission of movements and positions ofindicators by means of electric currents, the combination of oneapparatus, consisting of a bipolar rotor without windings and a statorhaving a primary winding, which is connected to a source of electricity,and also a secondary winding, with one or more apparatuses, consistingof a bipolar rotor without windings and a stator having only onewinding, whose sections are respectively connected to the sections ofsaid secondary winding at the corresponding points, substantially asshown and described.

2. In a system for the transmission of movements and positions ofindicators by means of electric currents, the combination of oneapparatus, consisting of a bipolar rotor without windings and a statorhaving a primary winding, which is connected to a source of electricity,and also a secondary winding, with one or more apparatuses, consistingof a bipolar rotor without windings and a stator having only onewinding, whose sections are respectively connected to the sections ofsaid secondary winding at the corresponding points, by lines, one ofwhich near to each apparatus is provided with a bell, which sounds onlywhen compensating currents occur and which stops ringing, when the rotoris adjusted, substantially as shown and described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

WILIIELM AUGUST 'IIIIERMANN.

Vi/itnesses:

PAUL Brennan Faiicirrniotrr, Lnononn RASCI-I.

